Textile bobbin



'Nov. 18, 1952 F. P. DOUGLAS TEXTILE BOBBIN Filed May 24, 1949 Patented Nov. 18, 1952 TEXTILE BOBBIN Frank Earls Douglas, Malvern, Victoria, Australia Application May 24, 1949, Serial No. 95,121 In Australia May 26, 1948 1 Claim.

This invention relates to bobbins suitable for machines employed in spinning and twisting yarns of various description and has for its general object to provide certain improvements which make for simplification and relative cheapness in manufacture while, at the same time, providing articles which have several important advantages over and above existing bobbins.

In the more commonly used Wooden bobbins, the separable end flanges are secured to the barrel by a number of wood screws. These end flan es after a relatively short period of continual use, become loose and the yarn being wound on to the bobbin is pulled into the crevices formed by the loose flanges, and not only causes valuable yarn to be wasted but also causes the bobbin to lose its original trueness and consequently give rise to vibration, which causes excessive spindle bearing wear and may also cause the spindle to become damaged by bending.

The present invention overcomes these disadvantages primarily for the reason that the flanges are structurally combined respectively with one end portion of the barrel and a detachable insert member for the other or non-flanged end of the barrel, so as to form what are, in eiiect, single units which can be readily and tightly interconnected although able to be disconnected when so desired.

The above and various other objects, features and advantages of the invention will, however, be more fully explained in the following description of a preferred embodiment, aided by reference to the accompanying drawings in which,

Figure 1 is a sectional elevation of the barrel and flange unit or assembly.

Figure 2 is a sectional elevation of the insert member and flange unit or assembly and also shows a metallic ferrule operatively applied thereto.

Figure 3 is an external elevation of the complete bobbin.

Figure 4 is an end view partly in section and partly broken away for convenience of illustration.

Figure 5 is another and view.

The main body or barrel 2 is of hollow cylindrical form and is preferably moulded from a synthetic resinous compound such as that known under the registered trade mark Bakelite or other suitable thermo-plastic material. The respective end flange 3 is structurally combined with one end portion of the barrel during the moulding of the latter so that, in effect, the two parts form a single unit.

This end flange 3 is preferably made from metal or laminated paper or woven fabric resinoid sheet, the reisnoid being the fundamental ingredient. The flange is of annular shape and is positioned in the mould for the formation of the barrel member prior to the moulding operation so that it becomes firmly bonded to the respective end portion of the barrel. This end portion is provided with a suitably shaped recess 4 to receive the driving portion of the machine spindle and this recess is also formed during the moulding of the barrel.

The other end of the barrel is formed with an internal or female screw thread 6 for the purpose of receiving an externally screw threaded boss 1 projecting inwardly from the insert memher 8 which is also moulded from a material the same as or similar to the barrel 2, member 8 has a flange 9- of similar composition to flange 3 and is integrally united to the member 8 during the moulding of the latter.

A metallic or like ferrule ll extends axially within a recess in the insert member 8 and may be applied in operative position during the moulding of the latter or it may be driven in to form a secure fit after the member 8 has been moulded.

When the insert member 8 is screwed into the barrel, even by hand, the two parts become practically inseparable but two tommy holes l2 may be formed in member 8 to accommodate pins outstanding from a twin key or like device whereby extra pressure may be applied in tightening and loosening the assembled parts.

All working parts of the bobbin are within the moulded parts which ensures greater durability to the wearing surfaces, as compared with wooden bobbins. This durability is important for the reason that, if the bore of the bobbin which accommodates the spindle be allowed to wear and becomes uneven as in the case of wooden bobbins, the entire balance of the bobbin is adversely affected. Proper balance is one of the main factors of high speed bobbins and spindles. Furthermore, with excessive wear, the bobbins alters its position on the spindle, e. g. the bobbin moves further down the taper of the spindle and the length of stroke of the machine which governs the laying of the yarn onto the bobbin has to be altered, otherwise imperfect winding results.

Various means may be adopted to ensure retention of the flanges 3, 9 in the moulded parts. Possibly the simplest procedure is for theinner aiimalar portion of each flange to be tapered as a If desired, the inner portion may have a series 3 of transverse holes lfla which are filled by the plastic material as pins during the moulding operation and thus key the respective flange in position.

The screw threads at the open end of the bar rel and around the insert member are shown as being of the conventional continuous helical type, but they could, for example, be of the form commonly used for jars or bottles and their closing caps in which only a partial turn is necessary to tighten or release.

Some of the more salient advantages of themvention are that the respective flanges cannot become loose from the barrel and the insert memher, as they are firmly secured in position during the moulding operations; the insert member can be readily removed and replaced by another-element having a flange of different diameter, as may be frequently desirable in actual practice; no separate screws, pins or other fastening elements are necessary to attach one component to the other as the two main components are formed with screw threads for that purpose.

The complete article will be found most eiiicient and'durable as it has great strength and is yet light in weight and can withstand rough-usage. It also has 'hi-gh'resistan'ce to Water and oil absorption.

Us to be understood that the mouldingoperations can be readily performed with the utmost precision, so that uniformity and inter-changeability are obtained. If so desired, the compcnents may be machined after moulding as that will eliminate warping. As further warpin will not-occur in the normal use of the bobbins, even i after long periods of steam treatment, maximum balance and accuracy is assured throughout the life o'f'the bobbins.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

A bobbin comprising a barrel with screw threads at one end, a detachable insert member with screw threads secured to said one end of the barrel by the screw threads, said barrel and insert member being composedofa plastic material, and two flanges with a plurality of perforations therein for the respective ends of the bobbin, one flange being combined with the other end of the barrel and the other flange combined with said insert ,member, and two groups of pins of which one group is integral with the barrel projecting through the perforations in its flange and the other group is integral with the insert projecting through the perforations of its flange so that the barrel and its flange and the insert member and its flange form single structural units.

FRANK PARIS DOUGLAS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 790,662 Reynolds May 23, 1905 1,515,143 Clinton Nov. 11, 1924 1,835,366 Atwood Dec. 8, 1931 1,846,397 Kennedy Feb. 23, 1932 2,140,497 Deters Dec. 20, 1938 2,333,340 Rickenbacher Nov. 2, 1943 2,331,871) Amrhein Aug. 14, 1945 FOREIGN PATENTS Number 'Country Date 647,149 France July 24, 1928 

